# Creating a variance column

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Member

Hi there, I am new to Domo and I have a question that I believe has an easy solution, however, I cannot figure it out. I have a table created to display Cost per load over the past three months. The formula for CPL is SUM(`carrier pay`)/ SUM(`Loads`). I want to have a column that displays the previous months CPL - Current months CPL and call it variance. I assume it requires a case statement stating if order ship date = previous month then previous CPL. However, I dont know how to write that.

• Coach
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@ColinHaze You can accomplish this using case statements inside your sums. The LAST_DAY function can be used to transform dates to the last day of the month so you can compare months.

Current Month CPL

```sum(case
when LAST_DAY(`Date`) = LAST_DAY(CURRENT_DATE())
then `carrier pay`
else 0 end)
/
sum(case
when LAST_DAY(`Date`) = LAST_DAY(CURRENT_DATE())
else 0
end)
```

Prior Month CPL

```sum(case
when LAST_DAY(`Date`) = LAST_DAY(DATE_SUB(CURRENT_DATE(),interval 1 month))
then `carrier pay`
else 0
end)
/
sum(case
when LAST_DAY(`Date`) = LAST_DAY(DATE_SUB(CURRENT_DATE(),interval 1 month))
else 0
end)
```

Variance

``` — Prior Month
(sum(case
when LAST_DAY(`Date`) = LAST_DAY(DATE_SUB(CURRENT_DATE(),interval 1 month))
then `carrier pay`
else 0
end)
/
sum(case
when LAST_DAY(`Date`) = LAST_DAY(DATE_SUB(CURRENT_DATE(),interval 1 month))
else 0
end))

-

— Current Month
(sum(case
when LAST_DAY(`Date`) = LAST_DAY(CURRENT_DATE())
then `carrier pay`
else 0 end)
/
sum(case
when LAST_DAY(`Date`) = LAST_DAY(CURRENT_DATE())
else 0
end))
```

• Coach
Options

@ColinHaze You can accomplish this using case statements inside your sums. The LAST_DAY function can be used to transform dates to the last day of the month so you can compare months.

Current Month CPL

```sum(case
when LAST_DAY(`Date`) = LAST_DAY(CURRENT_DATE())
then `carrier pay`
else 0 end)
/
sum(case
when LAST_DAY(`Date`) = LAST_DAY(CURRENT_DATE())
else 0
end)
```

Prior Month CPL

```sum(case
when LAST_DAY(`Date`) = LAST_DAY(DATE_SUB(CURRENT_DATE(),interval 1 month))
then `carrier pay`
else 0
end)
/
sum(case
when LAST_DAY(`Date`) = LAST_DAY(DATE_SUB(CURRENT_DATE(),interval 1 month))
else 0
end)
```

Variance

``` — Prior Month
(sum(case
when LAST_DAY(`Date`) = LAST_DAY(DATE_SUB(CURRENT_DATE(),interval 1 month))
then `carrier pay`
else 0
end)
/
sum(case
when LAST_DAY(`Date`) = LAST_DAY(DATE_SUB(CURRENT_DATE(),interval 1 month))
else 0
end))

-

— Current Month
(sum(case
when LAST_DAY(`Date`) = LAST_DAY(CURRENT_DATE())
then `carrier pay`
else 0 end)
/
sum(case
when LAST_DAY(`Date`) = LAST_DAY(CURRENT_DATE())